My New Soy Wax Feels Softer Than the Previous Bag From the Same Supplier — How Do I Check Whether Its Candle Performance Has Changed?

What "softer" can and cannot mean at goods-in

Squeezing a handful of new flakes and finding them softer, greasier or more crumbly than the last bag is a real observation, and it is worth taking seriously. But it is also one of the least controlled observations a candle maker can make. Soy wax softens noticeably as it warms, and a bag that has just come off a delivery van in the afternoon, or has sat near a sunny wall in your stockroom, can feel quite different from the same wax a day later.

There are three broad explanations, and your job at goods-in is to separate them. The first is temperature: the bag is simply warmer than the one you remember. The second is form: thinner flakes, more fines or a different surface finish change how the wax feels in the hand without changing what it is. The third is a genuine lot difference in the wax — a slightly different blend of fatty acids or degree of hydrogenation — which can shift hardness, and with it melt pool behaviour, adhesion and the way the candle ages on a shelf.

Only the third one affects candle performance, and only a controlled comparison can show it. The first two you can rule out cheaply before you commit jars and wicks to a test.

Condition the bag, then compare like with like

Before judging hardness, bring both lots to the same state. Leave the new bag, sealed, in the room where you keep your wax for at least 24 hours as a suggested starting point, alongside a retained sample of the previous lot if you have one. If your stockroom swings by several degrees between morning and afternoon, compare at the same time of day.

Then do not compare flakes at all. Flake feel is too dependent on shape. Melt about 100 g of each lot gently, check both with a thermometer, and pour them into identical containers — two small straight-sided jars or two silicone cups — at the same temperature. Let them set side by side on the same shelf for the same time. You now have two pucks of wax that differ only by lot.

If the pucks feel the same, the softness was temperature or form, and you can accept the lot on this point. If the new puck is clearly softer after identical conditioning, you have a genuine lot difference in hardness. That is not a reason to reject yet. It is a reason to find out whether the candle behaves differently, because some hardness variation makes no visible difference at all in a well-wicked container.

The performance check: a matched burn comparison

Softness matters because it changes how the wax melts around the wick. A softer lot can widen the melt pool faster, deepen it, carry more fuel up the wick, and in warm rooms increase the chance of sweating or a sunken surface. It can also cling to glass differently. None of that is certain. All of it can be tested in one short burn comparison using your standard formula.

Make three candles from the old lot and three from the new, identical in every other respect: same jar, same wick, same fragrance at the same load, same pour temperature, same cure. Burn them in the same draught-free room at the same time, never unattended, and extinguish any candle that smokes or flares.

As a suggested starting point, run three burn sessions of up to four hours each, letting the candles cool fully between sessions. That shows you the first-burn memory ring, which is where a softer wax most often reveals itself, and the steady-state behaviour that follows. If your normal product is burned to the end in your qualification testing, keep one candle from each lot going through to the end as well.

Worked example: the cost of six test candles

Say your standard product is a 200 ml matte glass jar with a thin Eco wick. The jars come at ₹708.00 for a pack of 10, which is ₹708.00 ÷ 10 = ₹70.80 each, so six test jars are 6 × ₹70.80 = ₹424.80. Thin Eco wicks cost ₹5.90 each at every pack size, so six are 6 × ₹5.90 = ₹35.40. Wax and oil are whatever your recipe uses for six candles.

One honest note about that jar: its product page describes a "fill weight of 200 ml", which is a volume, not a weight, and gives "Height 8 cm width 7 cm", which are outer dimensions. Weigh your own fill once, write it on the test record, and pour every test candle to that weight. A softer wax that is tested at a different fill weight from the old one has not been tested fairly.

Reading the results honestly

Three outcomes are possible, and each points to a different goods-in decision.

No meaningful difference. The new lot feels softer as a puck but burns within the normal spread of your old-lot candles. Accept it, record that the pucks were softer, and note that performance matched. That note is valuable: if a later lot is softer still, you know where the edge is.

A small, manageable difference. The new lot reaches full melt pool a little sooner, or pulls from the glass slightly more on cooling, but nothing smokes, tunnels, sweats or drowns. You can release it conditionally — for instance to cooler-month production or to jars where adhesion shows less — and keep watching finished stock. Do not change the wick for the whole range because of one lot unless a second comparison confirms it.

A clear performance change. Deeper pools, higher flames, soot, sweating or a sunken surface appear only in the new-lot candles. Keep the bag in quarantine and take the evidence to the supplier. For CSI that is WhatsApp on +91 7397976926; CSI does not publish melt-point tolerances or hardness figures per lot for its wax, so ask what they can tell you and write the reply down. A lot that performs clearly differently goes back as a question whoever sold it, us included — do not quietly absorb it by re-wicking your product.

What to write on the lot record

Keep it short and factual: date received, product, invoice number, bag weight, conditioning time and room temperature, puck comparison result in plain words, burn log summary, decision, and who made it. Seal 200 to 300 g of the new lot as the reference for the next delivery — a suggested quantity that you can adjust. If the lot was accepted as softer-but-fine, say so explicitly, because the next person to open a bag will want to know whether softer has already been tested.

Over a few deliveries, these records build something more useful than any single test: a picture of how much your supplier's wax normally varies and how much variation your formula tolerates. That is the real protection against the next soft bag.

Where this page fits

CSI already has guides that cover parts of this question. This page covers the goods-in check for the question above; these go deeper on the rest:

Three things to buy for this job

Frequently asked questions